Mon Prof Augmenté
Arms In, Spin Faster
When a spinning person pulls weights closer to their body, the spin gets faster. Moving mass inward makes the same spin happen in less time.
This picture is part of the full library
Every lesson is open to everyone for 7 days after it is published. This one came out on September 17, 2026: its text stays readable here, and its picture opens with a subscription.
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Age 13: open this week
Browse Age 13
In the picture
- A dumbbell held far from the stool’s center on an outstretched arm
- A dumbbell held close to the chest with bent arms
- A wide curved arrow around the left stool, one slow turn
- A tight cluster of curved arrows around the right stool, a fast spin
Examples
- A figure skater pulling in their arms during a spin
- A diver tucking into a ball to spin faster
Key takeaways
- Pulling mass toward the center makes a spin faster.
- Pushing mass away from the center makes a spin slower.
Carry on in the app
Three questions on this lesson. It has left the free week, so its quiz is for subscribers.
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